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Investments (Details Change in Unrealized) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investment [Abstract]      
Available for sale fixed income securities $ 156,645hcc_AvailableForSaleFixedIncomeSecuritiesChangeInNetUnrealized $ (324,363)hcc_AvailableForSaleFixedIncomeSecuritiesChangeInNetUnrealized $ 91,947hcc_AvailableForSaleFixedIncomeSecuritiesChangeInNetUnrealized
Other investments 0hcc_OtherInvestmentsChangeInNetUnrealized (2,534)hcc_OtherInvestmentsChangeInNetUnrealized 4,867hcc_OtherInvestmentsChangeInNetUnrealized
Equity securities (47,796)hcc_EquitySecuritiesChangeInNetUnrealizedInvestmentGainsLosses 44,266hcc_EquitySecuritiesChangeInNetUnrealizedInvestmentGainsLosses 8,812hcc_EquitySecuritiesChangeInNetUnrealizedInvestmentGainsLosses
Change in net unrealized investment gains (losses) $ 108,849us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax $ (282,631)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax $ 105,626us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax